A few open: a few buttons on a panel
Single control: ordinary key switch, usually a switch to control a lamp.
Dual control: dual control switch can control a lamp with another double switch. Turn on the lights in the living room and turn on the bedroom lights
Speed control switch: adjust the speed of the fan.
Dimming switch: mainly used to adjust the brightness of incandescent lamp (ordinary tungsten filament lamp) and save energy.
Sound control switch: a switch that is controlled by sound and illumination. When the ambient brightness is below a set value, and the noise of the environment exceeds a certain value, the switch will open.
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